FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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ENERGY AND DIGESTER GAS MASTER PLAN, PROJECT NO. PS21-04
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A Approve a Professional Services Agreement with Brown and Caldwell to provide engineering services for the Energy and Digester Gas Master Plan, Project No. PS21-04, for an amount not to exceed $1,438,037; and
B. Approve a contingency of $143,804 (10%).
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BACKGROUND
In the early 1990s, Orange County Sanitation District (OC San), constructed eight internal combustion engines at the Central Generation facilities at Plant Nos. 1 and 2 to generate electricity using digester gas with the waste heat used for digester heating, building cooling, and power generation. During normal operating conditions, the Central Generation facilities supply approximately 60% of the electricity at Plant No. 1 and 95% of the electricity at Plant No. 2.
OC San staff performs routine and regular maintenance based on hours of run-time per the manufacturer's recommendations. Recently, Engine No. 1 underwent its first bottom-end overhaul at 120,000 hours of run-time. The first two overhaul attempts on this engine using a contractor selected by a request for proposal process were unsuccessful. Using the original equipment manufacturer, the third overhaul was successful. OC San is planning to complete the overhaul of four more engines across both Plants to provide reliable operations for another 15-20 years.
During a utility power outage, OC San utilizes standby generators to provide primary treatment and keep water flowing through the treatment plants. The Central Generation facilities provide standby power for the remaining select treatment processes. Recently, the Regional Water Quality Control Board requested that OC San provide a standby power source to the Plant No. 2 Trickling Filter Sol...
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